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含能材料  2015 

喷雾干燥法中溶剂对RDX颗粒形貌和性能的影响

DOI: 10.11943/j.issn.1006-9941.2015.03.007

Keywords: 喷雾干燥 球形黑索今(RDX) 撞击感度 热分析

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Abstract:

采用喷雾干燥法制备微米级球形黑索今(RDX)。研究了乙酸甲酯、乙腈、丙酮、丁酮4种低沸点溶剂对制备的RDX颗粒形貌和性能的影响。采用扫描电镜(SEM)、差示扫描量热法(DSC)分析了所得RDX颗粒的形貌和热分解特性, 并测试了其撞击感度。结果表明:喷雾干燥法制备的RDX粒径为1~5 μm, 其中以丁酮为溶剂喷雾干燥制备的RDX颗粒形貌最好, 颗粒形状均为球形, 分散均匀, 颗粒表面光滑并且缺陷较少; 与原料RDX相比, 喷雾干燥法制备的RDX颗粒的撞击感度均明显降低, 特性落高较原料RDX提高了2倍以上; 热分析结果表明, 喷雾干燥法制备的球形RDX热分解的表观活化能(E)和热爆炸临界温度(Tb)均有所降低, 其中以乙酸甲酯为溶剂喷雾干燥制备的RDX的E和Tb分别降低了33.35 kJ·mol-1和7.77 ℃

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